Canon EF 17-40mm lens
The EF 17–40mm f/4L USM lens is a wide-angle lens made by Canon Inc. The lens has an EF mount to work with the EOS line of cameras. Other than the front element, it is sealed against dust and water, and features a diaphragm which remains nearly circular from f/4 to f/8. It is one of the few Canon photo lenses that are parfocal.
| Maker | Canon |
|---|---|
| Technical data | |
| Type | Zoom |
| Focus drive | Ultrasonic motor |
| Focal length | 17–40mm |
| Crop factor | 1.0 |
| Aperture (max/min) | f/4–f/22 |
| Close focus distance | 280mm / 11in |
| Max. magnification | 0.24 (at 40mm) |
| Diaphragm blades | 7 |
| Construction | 12 elements in 9 groups |
| Features | |
| Short back focus | No |
| Lens-based stabilization | No |
| Macro capable | No |
| Application | Ultra-Wide Zoom |
| Physical | |
| Max. length | 96.8mm / 3.8in |
| Diameter | 83.5mm / 3.3in |
| Weight | 475g / 1.1lbs |
| Filter diameter | 77mm |
| Accessories | |
| Lens hood | EW-83E, EW-83H, EW-83J |
| Case | LP1319 |
| Angle of view | |
| Horizontal | 93°–49°20' |
| Vertical | 70°30'–34° |
| Diagonal | 104°–57°30' |
| History | |
| Introduction | 2003 |
| Retail info | |
| MSRP | $800 USD |
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